How do you select only the maximum version of a list of documents that have different versions in SQL?

Question

I have a database table that looks like this:

| ID | TITLE | VERSION | 
| 1  | file1 |    1    |
| 2  | file2 |    1    |
| 3  | file1 |    2    |
| 4  | file2          


        

Answer 1

Indeed, use a subquery to obtain the MAX version, grouped by TITLE, and then join the result of it with your table to obtain the ID:

SELECT t.*
FROM tbl t INNER JOIN 
     (SELECT title, MAX(version) version
      FROM tbl
      GROUP BY title
     ) max_t ON (t.version = max_t.version AND t.title = max_t.title);

DEMO.